Stretchable web
View Patent ↗The present invention relates to stretchable webs having a plurality of elongated cells, and a retractive force mechanism to provide increased retractive force of the web when stretched in a given direction. The stretchable webs are useful in disposable garments such as diapers, bandages and other hygiene material so that the material fits closely without slipping off.
1. A stretchable web comprising:
a web having a first plurality of three-dimensional elongated cells, wherein said cells have a major and minor axes and an aspect ratio of about 5 to about 15, and are aligned in spaced-apart lanes along their major axes to provide mechanical elasticity in a direction perpendicular to their alignment, and
a retractive force mechanism disposed so as to provide increased retractive force to the first plurality of elongated cells in a direction opposite of said mechanical elasticity, wherein said retractive force mechanism
comprises a second three-dimensional web bonded to the first web, wherein said second web has a second plurality of elongated cells that have an aspect ratio of about 5 to about 15 and that are aligned in spaced-apart lanes along their major axes, said alignment being nonparallel to the alignment of the first plurality of elongated cells.
2. The stretchable web of claim 1 wherein said alignment of the second plurality of cells is offset from said alignment of the first plurality of cells by about 100 degrees.
3. The stretchable web of claim 1 wherein said alignment of the second plurality of cells is orthogonal to said alignment of the first plurality of cells.
4. The stretchable web of claim 1 wherein said alignment of the second plurality of cells is in the machine direction and said alignment of the first plurality of cells is in the cross direction.
5. The stretchable web of claim 1 wherein said second plurality of cells are spatially smaller than said first plurality of cells.
6. The stretchable web of claim 1 wherein said second plurality of cells have an aspect ratio that is smaller than the aspect ratio of said first plurality of cells.